facebook/mvfst

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1657 stars · 291 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

MVFST (move fast) is a C++ client and server implementation of the IETF QUIC transport protocol developed by Facebook. It provides a performant, UDP-based reliable multiplexed transport suitable for both internet and data-center use cases, with features like zero-RTT connection establishment, pluggable congestion control, and multi-threaded server support.

Use cases

• implement QUIC transport in a C++ application
• build a high-performance UDP-based server with zero-downtime restarts
• add QUIC client support to a mobile app on android or iOS
• experiment with custom congestion control algorithms like Copa
• race ipv4 and ipv6 connections with happy eyeballs
• integrate QUIC routing with katran load balancing

When to choose

• you need a production-tested QUIC implementation in C++
• you want pluggable congestion control and loss recovery algorithms
• you need zero-RTT connection establishment and GSO support at scale
• you are building for both client (mobile) and server deployments

When to avoid

• you need a simple HTTP/3 stack out of the box rather than a transport layer
• your project is not in C++ or cannot handle Facebook's dependency stack (folly)
• you only need a quick QUIC client for testing rather than embedding a transport library

Facets

library · maturity active

networking http-client http-server cryptography networking performance developer-tools microservices windows cpp cross-platform quic transport-protocol udp congestion-control facebook linux macos android ios

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markdown · JSON · MCP: product_card(name="facebook/mvfst")